Scott climbed 19,700 foot Licancabur volcano with a team of NASA astrobiologists (scientists who study life in the extreme, to understand how life might have once existed in the harsh environment of Mars). The summit crater, at 19,400 feet above sea level, is the location of the highest divable lake in the world. Scott and colleagues from Stanford and the University of Washington developed a remotely operated sonar mapping system using a battery-operated boat and fish sonar, and acquired depth and temperature data for half of the summit lake. He, Dr. Nathalie Cabrol (Principle Investigator from the SETI Institute) and colleagues also free dove the lake to collect water and cyanobacteria samples. Visit the Expedition page